Junior Seau, former New England Patriots linebacker who spent 20 years in the NFL, shot himself in the chest at his home in San Diego in early May. He was 43 years old. Photo: Reuters

Former Chicago Bears player Dave Duerson, 50, was found dead in his Florida home last year from a self-inflicted gunshot wound to the chest. According to TMZ, his family asked for his brain to be used for research and neurologists at Boston University found that he suffered from a neurodegenerative disease linked to concussions. Photo: Reuters

Kenny was a wide receiver for the Denver Broncos and was found dead in 2010 of an apparent suicide. He was a second-year pro, but had been on the team's injured reserve list with a knee injury. He was only 23 years old when he died. Photo: Reuters

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O.J. Murdock, a Tennessee Titans reciever, committed suicide on Monday. He was only 25-years-old.

Murdock, who signed with the Titans in 2011 as an undrafted free agent, was found in his car outside his former high school, Middleton, in Tampa, Fla., at approximately 8:30 a.m., in critical condition. He suffered from a self-inflicted gunshot wound, police spokeswoman Andrea Davis said, according to The Associated Press.

Al McCray, who was an assistant coach for the football team while Murdock was at Middleton, received a text message from Murdock at 3:30 a.m., just hours before he committed suicide.

"Coach, I want to thank you for everything you've done for me and my family. It's greatly appreciated," the text said, according to McCray. "At the end, Murdock wrote: "I apologize."

Murdock was taken to Tampa General Hospital, where he died hours later.

Due to a right Achilles injury, Murdock never played one game while he was signed to the Titans, USA Today reported.

While it is not yet known why Murdock commited suicided, he is one of several NFL players in the past two years who have killed themselves.

Several years ago, a study linked sustaining three or more concussions to clinical depression, according to the NYTimes. Many NFL players report suffering from depression, mostly once they retire, and it is believed to be linked to head injuries during their career. This causes many to question how the NFL handles concussion-related injuries.